/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.segment;

import org.apache.druid.segment.column.ColumnCapabilities;
import org.apache.druid.segment.column.ColumnHolder;

import javax.annotation.Nullable;
import java.util.List;

/**
 */
public interface ColumnSelector extends ColumnInspector
{
  /**
   * This method is apparently no longer used anymore, so deprecating it.
   */
  @Deprecated
  List<String> getColumnNames();

  @Nullable
  ColumnHolder getColumnHolder(String columnName);

  @Nullable
  @Override
  default ColumnCapabilities getColumnCapabilities(String column)
  {
    final ColumnHolder columnHolder = getColumnHolder(column);
    if (columnHolder == null) {
      return null;
    }
    return columnHolder.getCapabilities();
  }
}
